Ignition wiring query

Taking the ciggy lighter on a 110 (1992) as an example. Does the current flow thus:

from the battery
to the fuse box below the dash
to the ignition
to the lighter?

Also, how does the ignition switch actually work? Does it just connect all the circuits on rotation, or somehow act like a relay (connecting a higher powered circuit)? I see wires going into the ignition, but none coming out.

I'm diagnosing a reverse light fault at the moment and desperately need to understand this setup.

GreenLove said:

Taking the ciggy lighter on a 110 (1992) as an example. Does the current flow thus:

from the battery
to the fuse box below the dash
to the ignition
to the lighter?

Also, how does the ignition switch actually work? Does it just connect all the circuits on rotation, or somehow act like a relay (connecting a higher powered circuit)? I see wires going into the ignition, but none coming out.

I'm diagnosing a reverse light fault at the moment and desperately need to understand this setup.

Click to expand...

No.

I'm pretty sure I explained exactly how it is wired in one of your other threads.

It flows from the battery, to the small fuse box in the engine bay, to the ignition switch, then to the big fuse box below the dash, then to cigar lighter, reverse light switch or whatever other circuit.

The ignition switch itself is just a switch, but one that can handle higher currents that a small toggle switch can.

In the past week I have found two bloody excellent documents online that
describe the electrics brilliantly. One gives a written description of each circuit, the other gives colour coded wiring diagrams. Links are below.

http://www.legionlandrover.com/manuales/electrical schemes - defender 300 tdi.pdf

http://www.lhsw.com/d90/Defender_Electrical_Library.pdf

Maybe one of the mods can put them on a sticky or something?


Regarding your reverse light, have you checked for battery voltage at the input to the switch, and at the light itself yet?

mundungus said:

No.

I'm pretty sure I explained exactly how it is wired in one of your other threads.

It flows from the battery, to the small fuse box in the engine bay, to the ignition switch, then to the big fuse box below the dash, then to cigar lighter, reverse light switch or whatever other circuit.

The ignition switch itself is just a switch, but one that can handle higher currents that a small toggle switch can.

In the past week I have found two bloody excellent documents online that
describe the electrics brilliantly. One gives a written description of each circuit, the other gives colour coded wiring diagrams. Links are below.

http://www.legionlandrover.com/manuales/electrical schemes - defender 300 tdi.pdf

http://www.lhsw.com/d90/Defender_Electrical_Library.pdf

Maybe one of the mods can put them on a sticky or something?


Regarding your reverse light, have you checked for battery voltage at the input to the switch, and at the light itself yet?

Click to expand...

Sorry if you've helped me out on this before. I'm so overcome by wiring diagrams and dashboard parts that I'm not thinking straight. Remember when Richard Dreyfuss built the mud mountain in his kitchen in Close Encounters of the Third Kind? That's the level of insanity that diagnosing this fault has caused.

Right, straight head on.

Mine the 200Tdi by the way.

Yes, the bulb holder and wiring has been tested from the rear to the engine compartment, all fine. The switch and fuse is fine too. At the moment, something is preventing the current flowing from after the switch to where the wiring ends up in the engine compartment (before it goes to the the rear). I'm a little confused as to why the wiring coming from the reverse light switch goes into the back of the dash to join the wire that then runs to the reverse light at the rear - is this for a reverse light indicator on the dash or something? I have another thread for this.

Thanks

Think you may be thinking too hard - if the circuits are working, leave well alone is always good advice with a Landy

Ps - not aware of any dash reverse light indicator?

EDIT: Seen your other thread and get that the reverse light isn't working. If the switch is working, suspect break in wiring within the chassis somewhere - maybe run a new wire?

Station House said:

Think you may be thinking too hard - if the circuits are working, leave well alone is always good advice with a Landy

Ps - not aware of any dash reverse light indicator?

EDIT: Seen your other thread and get that the reverse light isn't working. If the switch is working, suspect break in wiring within the chassis somewhere - maybe run a new wire?

Click to expand...

Tested wire from rear to engine compartment, all fine.

Switch is fine too.